Davit



C. HOLLERITH May 15, 1962 DAVIT" 3 Sheets-Sheet 2 Filed April 29, 1957INVENTOR (H/484:5 //0zz/7H BY Vim Wilma ATTORNEY May 15, 1962 c.HOLLERITH 3,034,156

' DAVIT Filed April 29, 1957 3 Sheets-Sheet 3 INVENTOR (Hflflif Awa e/7%BY Mm ATTORNEY United States Patent DAVIT r Charles Hollerith, Jackson,Mich, assignor to Walstrom Products, Inc., a corporation of MichiganFiled Apr. 29, 1957, Ser. No. 655,807 8 Claims. (Cl. 9-39) The presentinvention relates to improvements in davit structure used to support adinghy, lifeboat or other similar small water craft from the deck of alarger boat or ship, and particularly to davit structure designed to beused at the stern.

It is an object of this invention to provide a davit so constructed asto follow the sheer line of the water craft and thus will not detractfrom the appearance of the water craft or interfere with the stern view.

Another object is to provide a davit for installation from the deck andtransom of a boat as to distribute the load between the deck and transomand avoid damage to the deck or transom especially during a heavy sea.

Another object is to provide a davit which is readily adapted to boatshaving either a forward sloping stern transom or an outwardly slopingstern transom.

A further object of the invention is to provide a davit which isadjustable horizontally to accommodate the same to water craft ofdifferent beam.

A still further object is to provide an improved davit having a metalbracket and a wooden beam and transom stop.

A still further object is to provide a davit which is adjustable todifferent transom structure.

Yet another object of the invention is to provide a davit having a novelblock and tackle arrangement.

These and other objects and advantages residing in the combination,construction and arrangement of parts will more fully appearhereinafter,

Referring to the drawings,

FIG. 1 is a side elevational view of one form of davit shown applied toa forward sloping transom, with a dinghy shown in section,

FIG. 2 is a plan view of FIG. 1,

FIG. 3 is an enlarged detail view of the transom abutment structureshown in FIG. 1,

FIG. 4 isa view similar to FIG. 3 of a modified form of transom abutmentstructure,

FIGS. 5, 6 and 7 are cross-sectional views taken on line V-V, VIVI andVIIVII, respectively, of FIG.1,

FIG. 8 shows the davit of FIG. 1 applied to an outwardly slopingtransom,

FIG. 9 is a view similar to FIG. 1 of a davit having a wooden beam andtransom abutment stop shown applied to an outwardly sloping transom,

FIG. 10 is a view'showing the davit of FIG. 10 applied to a forwardlysloping transom,

FIG. 11 is a detail view of the gunwale plate and pin bracket, and

FIGS. 12 and 13 are enlarged details of the pulley block.

Referring to the drawings, in the form of the invention shown in FIGS. 1and 2 my improved davit structure 10 is shown mounted on forwardlysloping transom 12 and supporting a dinghy 14.

Davit 10 preferably comprises a beam which comprises a cast aluminummain arm 16 and a cast aluminum extension 18. Arm 16 is shown forked fora substantial portion of length to provide parallel portions 20 and 22having at their outer ends 23 longitudinally extending grooves 24 (seeFIG. 7) in which longitudinally extending ribs 26 on the extension 18are received. Extension 18 is longitudinally slotted at 28 through theribs 26 to permit the extension 18 to be adjusted between the portions20 and 22 to vary the overall length of the davit 10. Clamp bolts 30located in holes in the portions 20 and 22 and extending through theslot hold the extension 18 in position of adjustment along the arm 16.At the outer end 32 of the extension 18 is an abutment end 34 whichdepends from the extension 18 to engage the gunwale of the dinghy 14.

As shown in FIG. 5, the arm 16 is of I-section adjacent inner ends ofthe forked portions 2! and 22 and is provided with a longitudinallyextending slot 36 along which the attachment pin bracket 38 is adjustedand clamped in position of adjustment by the bolts 40 to be properlypositioned to be received in the slot in the gunwale plate 41 attachedto the gunwale of the dinghy 14 and designed to hold the oppositegunwale against the abutment 34.

At the inner end of the davit 10 is the pivot and attachment portion 42and the depending thrust portion 44, the latter carrying the adjustableabutment screw 46 having a balled end 48 to engage in the socketedtransom plate 50 attached to the transom 12 by fasteners 52. Portion 42has a pivotal connection with the vertical spaced sides of the davitbracket 54 through the pivot bolt 56. Suitable fasteners 58 attach thebracket 54 to the deck 60.

As more clearly shown in FIGS. 6, 12 and 13 the upper block 62 of thetackle for raising and lowering the dinghy relative to the davit 10takes the form of a casting having a base portion 64 which is receivedon the upper pair of the ledges 66 provided along the upper and loweredges of the portions 20 and 22. Clamp members 68 extend between thelower ledges 66 receiving clamp bolts 70 for adjustably clamping thecasting 62 along the portions 26 and 22. Upstanding from the base 62 isan integral flange 72 defining an elongated opening 74 parallel to thelongitudinal axis of the davit 10 andan opening 76 at a slight anglethereto. Sheaves 78 and 80 are disposed in the openings 74 and 76 androtatably supported on shafts 82 carried by the opposed sides of theflange 72. A hole 84 is provided in the base 62 to receive an end of thetackle rope and to act as a supporting abutment for a knot tied in theend of the rope.

With the upper block 62 of the tackle of the described construction anduse in combination with a conventional double sheave lower block 86having a hook attached to the eye or ring 83, the ropes extendingbetween the upper and lower tackle block are always disposed in twoparallel spaced planes and there is no tending for the blocks to twistrelative to each other and the blocks may approach each other to thepoint of abutment. It will be understood that the rope extendsdownwardly through the hole 84 around a sheave of the lower tackleblock, up through the clearance 90, across the sheave 80 and downthrough the clearance 92, around the other sheave of, the lower tacklefbl-ock, up through the clearance 94 and across the sheave 78 to thecleat 96.

To adjust the davit 10 to various transoms, in addition to a horizontaladjustment of the screw 46, angular adjustment about the axis of thepivot pin 98 (see FIG. 3) may be desired. As shown, this may beaccomplished by threading the screw 46 through pin 98 which is rotatablysupported in the forked end 100 of thrust portion 44. Narrow arcuatebosses 102 are provided on the inner opposed faces of the end 100 andbetween which the screw 46 may swing about the axis of the pin 98. Aclamping shoe 104 is carried on the screw 46 and forced into frictionalengagement with the bosses 162 by rotating the nut 106 to hold the screw46 in different positions of angular adjustment. To change adjustment itis only necessary to back off the nut 106 slightly to release the thrustupon the shoe 104. The nut 106 also acts as a lock nut for the screw 46.This arrangement makes it very simple to correctly locate the end 48 inbolt 56 is adjacent one endof the bracket whereby the bracket may bereversed to accommodate difierent tran- 'som slopes and maintainadequate supporting relation ships.

Referring to FiG. 8 the davit is shown adapted to an outwardly slopingtransom wit brackets 54 turned end for end and switched from starboardto port.

FIG. 4 shows a modified adjustment screw 46' in the thrust portion 44',the portion 44 having an integral" threaded boss 198 in which the screw46' is threaded and held in position of adjustmentby the jam nut 110. Asthe screw46 has no angular adjustment, it is necessary to determine thenecessary extension of the screw 46' and then attach the plate St? inthe resulting. position on the transom. As such adjustment need only bemade at the time of initial installation of the davit, the lack ofangular adjustment of the screw 46' is not too important and therigidity of the structure may more than compensate for lack of angularadjustment. 7

FIGS. 9, 10 and 11 show the principles ofthe present invention adaptedto a combined metal and .wood davit.

As shown the wooden beam 111 is fitted at one end int the socket openingof the L-shaped cast metal thrust and transom, and an adjustableabutment at the lower end of said abutment portion for bearing againstthe transom determining the angular relationship of said beam to thedeck.

2. Davit structure as defined in claim 1, said beam having an adjustableouter end extension. 3. Davit structure as defined'in claim 1, said beamhaving an outer end, an adjustable extension supported in said outerend, and a tackle block axially adjustably supthe plate 120 on thetransom. .In FIG. 10 the'structure of FIG. 9 is shown adapted to anotherform of transom.

' FIG. 11 shows the manner of attachment of the pin bracket 38' on thebeam 111.

It is within the scope of the invention 'tohave the beamof the davitnon-extensible with the elimination of the extensionlS. As the gunwalepin or latch bracket '38 as well as the tackle block 62' may be adjustedalong the beam arm '16, such adjustment may be emthe tackle will holdthe gunwale pin or latch engaged in the gunwale plate41. Obviously, thelatching structure.

'betweenthe bracket 38 and plate 41 may take numerous ported upon saidouter end inwardly of said extension.

4. A davit adapted to be pivotally mounted to a boat deck, comprising incombination, a beam portion having an inner end portion, pivotal meansmounting said inner end portion to said'deck, a thrustportionrigidlyangularly associated with said beam and extending therebelow and anabutment mounted on said thrust portion spaced below said inner endportion engaging exterior boat structure'below the deck level.

5. A davit as defined in claim 4 wherein said abutment comprises anadjustable member selectively movable with respect to said thrust;portion.

' 6. A davit as defined in claim 4 wherein a bracket is A mounted uponthe boat deck and said pivotal means comprises a pivot pininterconnecting said inner beam por- 7 tion and said bracket. 7

i 7. A davit'as defined-in claim 4 wherein a tackle block is adjustablymounted on said beam portion for selected positioning thereon.

8. A, cast metal davit comprising a beam having a main arm portiongenerally of l-section with a horizontal portion having an inner pivotend and a downwardly dependingthrustabutment portion spacedfrom saidpivot end along said horizontal portion and rigid therewith, saidhorizontal portion at its outer end having merging from its l-section anintegral forked section, a generally I-section horizontal extensiondisposed at its inner end 7 in said forked section, means for clampingsaid forked forms. As shown, the flanged'pin of the bracket 38 'isvertically'adjustable and engages in the notch of the slot in the plate41. Other latching structure such as a pin and aperture, bayonet slotand pin and the like are self-suggesting. 7

When the extension 18 is not desired, the tackle block 7 62 may beadjustably mounted along either side of the davit beam in lieu. of-theforked end mounting shown.

I-claim: I V -1. In combination, davit structure for watercraft hav- 1ing a substantially horizontal deck and a transom angularly disposedthereto comprising a deck mounted bracket having a pivot pin, abeamcarrie'd upon said pin at itsinner end, a thrust abutment portiondepending from the underside'of saidbeam and rigid therewith and spacedvfrom said inner end to clear the deck and overhang the section upon saidextension, said forked section between said I-section of said main'armportion and said extension having spaced vertical side portions, atackle block "mounted upon said side portions,'apair of sheaves in saidblock aligned with the vertical clearance between said side portions,said sheaves having their axis ofrotation' slightly angularly related toone another.

Blessing Feb. 24, 1880 723,677 Kade Mar. 24, .1903 1,084,630 HawthornIan/20, 1914 1,121,116 Morrill Dec. 15, 1914 1,612,604 Branden Dec. 28,1926 1,714,452 Schat May 21, 1929 1,846,953 Dillon Feb. 23, 1932 2,259,253 Kozlovskis Oct. 14, 1941 2,279,887 Hathorn j Apr. 14, 19422,575,564 Rinkel Nov. 20, 1951 2,650,378 Weinstein Sept. 1, 19532,699,874 Brnaerts Jan. 18, 1955 FOREIGN PATENTS 3,924 Great Britain1904 Great Britain 1 914

